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Anthropic ↗Released May 22, 2025

Claude Sonnet 4

#3 Arena RankUndisclosed parameters

Claude Sonnet 4 ranks in the top 10 on the Arena leaderboard. Context window: 0.2K tokens.

Context

200K

Input

$3.00

Key Specifications

🏆

Arena Rank

#3

📐

Context Window

200K

📥

Input Price

per 1M tokens

$3.00

📤

Output Price

per 1M tokens

$15.00

🧠

Parameters

Undisclosed

🔒

Open Source

No

Best For

Codingwritinglong documents

About Claude Sonnet 4

Claude Sonnet 4 is Anthropic's balanced mid-tier model, offering an excellent combination of intelligence, speed, and cost-effectiveness. It ranks among the top 5 models globally on arena benchmarks while being significantly more affordable than Opus 4. With a 200K token context window, Sonnet 4 handles long documents and complex codebases with ease. The model excels at coding tasks (strong SWE-bench performance), long-form writing, document analysis, and structured data extraction. Its extended thinking capabilities allow it to tackle complex problems while maintaining fast response times for everyday tasks. Sonnet 4 is the most popular Claude model for production applications, offering the best price-to-performance ratio in Anthropic's lineup. It supports tool use, vision capabilities, and works seamlessly in agentic workflows.

Built byAnthropic↗

Pricing per 1M tokens

Input Tokens

$3.00

Output Tokens

$15.00

Compare Claude Sonnet 4

See how Claude Sonnet 4 stacks up against other leading AI models

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Frequently Asked Questions

What is Claude Sonnet 4?▾
Claude Sonnet 4 is Anthropic's balanced mid-tier model, offering an excellent combination of intelligence, speed, and cost-effectiveness. It ranks among the top 5 models globally on arena benchmarks while being significantly more affordable than Opus 4. With a 200K token context window, Sonnet 4 handles long documents and complex codebases with ease. The model excels at coding tasks (strong SWE-bench performance), long-form writing, document analysis, and structured data extraction. Its extended thinking capabilities allow it to tackle complex problems while maintaining fast response times for everyday tasks. Sonnet 4 is the most popular Claude model for production applications, offering the best price-to-performance ratio in Anthropic's lineup. It supports tool use, vision capabilities, and works seamlessly in agentic workflows.
How much does Claude Sonnet 4 cost?▾
Claude Sonnet 4 costs $3.00 per 1M input tokens and $15.00 per 1M output tokens. You pay only for what you use, which keeps costs predictable.
What is Claude Sonnet 4's context window?▾
Claude Sonnet 4 has a context window of 200K tokens. This determines how much text the model can process in a single request — bigger windows mean longer documents and richer conversation history.
Is Claude Sonnet 4 open source?▾
No, Claude Sonnet 4 is a proprietary model available through Anthropic's API. You get managed infrastructure, regular updates, and support as part of the package.
What is Claude Sonnet 4 best for?▾
Claude Sonnet 4 is best suited for: Coding, writing, long documents. These use cases play to the model's strengths in capability, speed, and cost within Anthropic's lineup.